John h



(No Mod el'.)

J. H. BAWDEN.

MOLDING FLASK.

Paten ged J uly 3; 1883.

N4 PETERS. Pfinmmn m her. Washmglun. 0v (3.

UNITED STATES PATENT IQFFICE.

JOHN H. BAVDEN, OF FREEHOLD, NEW JERSEY.

MOLDlNG-FLASK.

SPECIFICATION forming part of Letters Patent No. 280,557, dated July 3,1883.

1 Application filed May 24,1883. (No model.)

T0 on whom it may concern:

Be it known that I, JOHN H. BAWDEN, a citizen of the United States, anda resident of Freehold, Monmouth county, New Jersey,'have inventedcertain Improvements in Molding- Flasks, of which the following is aspecification.

My invention consists of certain improvements in 1nolding-flasks, myinvention consisting, mainly, of a plate or bar forming part of theupper portion or cope, or of the mid dle portion or cheek of the flask,and constructed to hold the sand in proper form, substanti ally in themanner described hereinafter.

In the accompanying drawings, Figure 1 is a vertical section of part ofa molding-flask illustrating my invention, the upper portion or cope oftheflask being elevated above the lower portion; Fig. 2, a general planview, drawn to a reduced scale, of the said cope; Fig. 3, a perspectiveview of part of one of the cross bars or plates of the cope, and Fig. 4an enlarged perspective view of part of the said plate. I

My invention is of general applicability in molding wherever the sand inthecope or cheek has prominent projections, forming cores for the mold,and terminating in compara tively sharp edges.

I have selected for illustration a mold the mass of sand B in whichhasdeep and tapering indentations or recesses formed by packing the saidsand against a pattern, A, having deep tapering recesses a, into whichthe sand D of the upper portion or cope of the flask is packed, and fromwhich the projecting masses of sand have to be withdrawn with the copewhen the latter is elevated prior to the removal of the pattern. Inother words, the projections or ribs 6 are the cores of the mold, andthese cores are carried by the cope.

It has been the practice in such cases as I have explained to usegaggers for maintaining the integrity of projecting tender cores inmolding. These gaggers, which are simple strips of metal, with bent or Tends, are embedded in the sand to keep it together, the gaggers beingsometimes passed over the bars of the cope, at their upper ends, so asto support the cores in which they are embedded.

In preparing a mold of the character shown, or any other mold in whichthere are deep re cesses in one part of the flask and projecting coreson the other part, I combine with the cope or other part of the flaskone or more plates or bars, G, in which are numerous perforations, m,and at the edge dovetailed recesses f. Thus, in preparing the mold, Fig.1, thereis one of these plates Gr wherever a projectingrib or core 12occurs, the plate extending downward into the recesses of the pattern,so that on packing the sand the latter will enter the perforations andthe dovetailed recesses; hence on elevating the cope there will becomplete and compact cores, each being composed of part of one of theplates, and sand clinging to both sides, owing to the perforations, andto the lower edge, owing to the dovetailed recesses. If the core has toterminate in a comparatively sharp lower edge, as in the presentinstance, I bevel the lower edge of the plate in the manner bestobserved in Fig. 4. In the present case, the lower edges of the platesare straight; but the shape of each plate will depend upon therequirements of the cores, of which many different forms are used inmolding, it being advisable to form the dovetailed recesses around theentire edge of that part of the plate which is embedded in the sand.

The plates or bars may in some flasks be carried by the middle sectionor check, instead of by the cope; or both cope and cheek may befurnished with said plates. In the present instance the cope has butthree plates G, as shown in the plan view, Fig. 2; but there are casesin which a single plate only will be required, or in which more thanthree may be necessary.

I claim as my invention 1. The combination, with a molding-flask, of aplate or bar having dovetailed rccessesf at the edge, substantially asset forth.

2. A molding-flask plate or bar beveled at its edge and havingdovetailed recesses at the said beveled edge, substantially asdescribed.

3. A perforated molding-flask plate or bar having dovetailed recesses atits edge, substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN H. BAVDEN.

\Vitnesses:

' J os. T. LAIRD,

WM. T. GAVART.

